[gs-bugs] [Bug 691314] New: pattern accumulator needs to have its own copy alpha operation

[bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=691314

           Summary: pattern accumulator needs to have its own copy alpha
                    operation
           Product: Ghostscript
           Version: HEAD
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P4
         Component: Color
        AssignedTo: michael.vrhel at artifex.com
        ReportedBy: michael.vrhel at artifex.com
         QAContact: gs-bugs at ghostscript.com
   Estimated Hours: 0.0


Commit, rev 11213 fixed a problem when using GraphicsAlphaBits in the presence
of patterns.  The fix involved intialializing the pattern's bit buffer
appropriately so that when gx_default_copy_alpha performed a get_bits command
it would obtatin valid data.   It would be better to have the pattern
accumulator set up with it's own copy_alpha opereation that made use of the
mask buffer in the pattern object that keeps track of data that has been drawn
in the pattern's buffer.  The copy_alpha will need to update the mask to ensure
that the anti-aliased graphic is completely drawn when the tiling operation
occurs as well as make use of the mask to only compute the alpha from those
values.

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